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    3 inch Pilot Operated Pressure Relief Valve, DN80

    Lower cost pilot operated pressure relief valve with 3" inlet and outlet ports, flanged connection. The 3-inch pilot-operated relief valves (PORV) are used for emergency relief during overpressure events.
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    Delivery date: 10-20 days

    ATO pressure relief valve with DN80 nominal diameter, nominal pressure is 16 MPa, and the sealing pressure is 1.76 MPa. The water pressure reducing valve has the advantages of good sealing performance, easy installation and maintenance, and long service life.


    • Pilot-operated valves for limiting a system pressure
    • Operation using proportional solenoid
    • Maximum pressure limitation
    • Valve and control electronics from a single source
    • Little manufacturing tolerance of the command value
    • Pressure characteristic curve


    Pilot Operated Pressure Relief Valve Details


    • Model: ATO-200X-DN80
    • Size: 3 inch
    • Nominal diameter: DN80
    • Structural form: Diaphragm type
    • Pressure rating: PN16
    • Shell test pressure: 2.4 MPa
    • Sealing test pressure: 1.76 MPa
    • Ambient temperature: ≤80℃
    • Connection method: Flange
    • Medium: Water
    • Valve body material: Ductile iron QT450


    Pilot operated preesure relief valve dimension

    Dimension L D2 D1 x-n T F D
    DN80 275mm 200mm 160mm 8-φ19 20mm 3mm 132mm


    Pilot operated preesure relief valve dimension


    • It is recommended to install an exhaust valve on the top of the riser to make the pressure reducing valve work more smoothly.
    • Before installing the pressure relief valve, check the valve for unusual items and be sure to flush the pipeline.
    • Installation method: Horizontal or vertical installation, single valve set.

    Pressure Relief Valve Application

    Pilot operated pressure relief valve application

    Tips: What is difference between pressure relief valve and pilot-operated pressure relief valve?

    Process pressure exerts an opposing force on the disc. When the process pressure force on the disc overcomes the opposing spring force, the disc lifts and the valve begins to relieve pressure. In contrast, a pilot operated valve uses process pressure to keep the valve closed until set pressure is reached.

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